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/**
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* Copyright (C) 2007 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package eu.etaxonomy.taxeditor.ui.section.description;
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import java.util.List;
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import org.apache.logging.log4j.LogManager;
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import org.apache.logging.log4j.Logger;
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import org.eclipse.core.runtime.IProgressMonitor;
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import org.eclipse.core.runtime.IStatus;
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import org.eclipse.core.runtime.Status;
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import org.eclipse.core.runtime.jobs.Job;
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import org.eclipse.e4.ui.workbench.modeling.EPartService;
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import org.eclipse.swt.widgets.Display;
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import eu.etaxonomy.cdm.api.service.NaturalLanguageGenerator;
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import eu.etaxonomy.cdm.model.description.TaxonDescription;
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import eu.etaxonomy.cdm.model.description.TextData;
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import eu.etaxonomy.cdm.model.term.TermTree;
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import eu.etaxonomy.taxeditor.model.AbstractUtility;
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import eu.etaxonomy.taxeditor.preference.PreferencesUtil;
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import eu.etaxonomy.taxeditor.store.CdmStore;
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import eu.etaxonomy.taxeditor.ui.element.CdmFormFactory;
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import eu.etaxonomy.taxeditor.ui.element.ICdmFormElement;
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import eu.etaxonomy.taxeditor.ui.element.LabelElement;
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import eu.etaxonomy.taxeditor.ui.section.AbstractCdmDetailElement;
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/**
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 * @author n.hoffmann
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 * @created Sep 16, 2010
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 */
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public class NaturalLanguageDetailElement extends AbstractCdmDetailElement<TaxonDescription> {
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	private static final Logger logger = LogManager.getLogger();
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	private LabelElement label;
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	/**
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	 * <p>Constructor for NaturalLanguageDetailElement.</p>
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	 *
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	 * @param formFactory a {@link eu.etaxonomy.taxeditor.ui.element.CdmFormFactory} object.
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	 * @param formElement a {@link eu.etaxonomy.taxeditor.ui.element.ICdmFormElement} object.
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	 */
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	public NaturalLanguageDetailElement(CdmFormFactory formFactory,
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			ICdmFormElement formElement) {
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		super(formFactory, formElement);
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	}
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	/** {@inheritDoc} */
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	@Override
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	protected void createControls(ICdmFormElement formElement,
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	        TaxonDescription entity, int style) {
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		label = formFactory.createLabel(formElement, "Generating Natural Language Description ...");
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		if(entity.hasStructuredData()){
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			FetchNaturalLanguageDescriptionJob job = new FetchNaturalLanguageDescriptionJob("Retrieving Natural Language Description", entity);
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			job.schedule();
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		}else{
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			label.setText("Taxon Description does not contain structured data.");
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		}
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	}
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	@Override
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	public void handleEvent(Object eventSource) {
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		// nothing gets edited, nothing gets updated
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	}
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	private class FetchNaturalLanguageDescriptionJob extends Job {
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		private TaxonDescription entity;
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		private NaturalLanguageGenerator generator = new NaturalLanguageGenerator();
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		private TermTree<?> featureTree = PreferencesUtil.getDefaultFeatureTreeForStructuredDescription();
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		private Display display = Display.getCurrent();
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		public FetchNaturalLanguageDescriptionJob(String jobName, TaxonDescription entity){
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			super(jobName);
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			this.entity = entity;
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		}
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		@Override
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		protected IStatus run(IProgressMonitor monitor) {
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			String text = "";
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			if(featureTree != null){
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				try{
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					List<TextData> naturalLanguageDescription = generator.generateNaturalLanguageDescription(featureTree, entity, CdmStore.getDefaultLanguage());
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					for(TextData element : naturalLanguageDescription){
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						text += element.getText(CdmStore.getDefaultLanguage()) + " ";
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					}
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				}catch(Exception e){
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					logger.error(e);
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				}
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			}
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			else{
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				text = "Could not generate natural language description, because no Feature Tree was set.";
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			}
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			final String aggregatedText = text;
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			display.asyncExec(new Runnable(){
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				@Override
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				public void run() {
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				    if(!label.isDisposed()){
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				        label.setText(aggregatedText);
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				        AbstractUtility.reflowDetailsViewer(formFactory.getContext().get(EPartService.class));
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				    }
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				}
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			});
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			return Status.OK_STATUS;
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		}
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	}
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	@Override
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	public void fillFields() {
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		if(getEntity().hasStructuredData()){
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			FetchNaturalLanguageDescriptionJob job = new FetchNaturalLanguageDescriptionJob("Retrieving Natural Language Description", getEntity());
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			job.schedule();
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		}else{
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			label.setText("Taxon Description does not contain structured data.");
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		}
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	}
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}
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